WANG Chao,XIAO Tian-gui,JIA La,et al.Changes in Days of Snowfall/Precipitation Ratio in Tibet[J].Journal of Chengdu University of Information Technology,2017,(05):532-536.[doi:10.16836/j.cnki.jcuit.2017.05.011]
西藏地区降雪降水天数比率(SD/PD)变化特征分析
- Title:
- Changes in Days of Snowfall/Precipitation Ratio in Tibet
- 文章编号:
- 2096-1618(2017)05-0532-05
- Keywords:
- atmospheric science; climate change; snow; precipitation; ratio
- 分类号:
- P467
- 文献标志码:
- A
- 摘要:
- 为研究高原地区降水相态变化特征,利用西藏自治区39个气象站点降水和温度等观测资料,分析了该区域1979-2013年的降雪/降水天数比例特征,结果表明:西藏地区(9月-次年5月)平均雪水天水比为19.29%,其比值空间分布不均,西藏东部及腹地偏小,北、西、南3面各站偏大; 指数关系可以较好的拟合西藏地区雪水比率与温度、海拔的关系,可对缺少观测资料的高原地区雪水比天数特征进行初步估算; 近35年西藏地区雪水天数比总体呈现显著下降趋势,其倾向率为-1.27%/10a,除西藏南部小部分区域站点呈增加趋势外,其余站点雪水比率均呈减小趋势,其春、秋季下降最为显著,高海拔地区(海拔>4500 m)雪水比率下降最为显著。
- Abstract:
- In order to study the characteristics of precipitation phase in plateau area, the observation data from 39 stations in Tibet during 1929-2013 were used, and the changes of snowfall/precipitation(SD/PD)ratio studied. The main conclusions obtained are as follows: main conclusions obtained are as follows: the average of SD/PD ratio in Tibet is 19.29%, and its spatial distribution is uneven. The value of SD/PD is low at east and hinterland of Tibet, while at north/west/south boundary of Tibet is high; the relationship between SD/PD and temperature and latitude is described accurately by exponential functions, and it will benefit places in Tibet which is lack of observational data. SD/PD ratio in Tibet has decreased distinctly during the recent 35 years, and the tendency rate is-1.27%/10a. Except for few stations in south of Tibet, the SD/PD ratio is decreasing, and it is more significant in spring and autumn. The ratio of high latitude stations(>4500 m)has faster decline than others.
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备注/Memo
收稿日期:2017-03-08 基金项目:气象科研专项资助项目(GYHY201406015、GYHY201306009)、国家自然科学基金资助项目(91337215)、国家科技支撑计划资助项目(2015BAC03B05)、国家重点基础研究发展计划资助项目(2013CB733206)